我想在正则表达式中使用一个变量,我如何在Python中做到这一点?
TEXTO = sys.argv[1]
if re.search(r"\b(?=\w)TEXTO\b(?!\w)", subject, re.IGNORECASE):
# Successful match
else:
# Match attempt failed
我想在正则表达式中使用一个变量,我如何在Python中做到这一点?
TEXTO = sys.argv[1]
if re.search(r"\b(?=\w)TEXTO\b(?!\w)", subject, re.IGNORECASE):
# Successful match
else:
# Match attempt failed
当前回答
我需要搜索彼此相似的用户名,Ned Batchelder说的非常有用。然而,当我使用re.compile创建我的re搜索项时,我发现我有更清晰的输出:
pattern = re.compile(r"("+username+".*):(.*?):(.*?):(.*?):(.*)"
matches = re.findall(pattern, lines)
输出可以使用以下命令打印:
print(matches[1]) # prints one whole matching line (in this case, the first line)
print(matches[1][3]) # prints the fourth character group (established with the parentheses in the regex statement) of the first line.
其他回答
你可以尝试使用格式语法sugarer的另一种用法:
re_genre = r'{}'.format(your_variable)
regex_pattern = re.compile(re_genre)
from re import search, IGNORECASE
def is_string_match(word1, word2):
# Case insensitively function that checks if two words are the same
# word1: string
# word2: string | list
# if the word1 is in a list of words
if isinstance(word2, list):
for word in word2:
if search(rf'\b{word1}\b', word, IGNORECASE):
return True
return False
# if the word1 is same as word2
if search(rf'\b{word1}\b', word2, IGNORECASE):
return True
return False
is_match_word = is_string_match("Hello", "hELLO")
True
is_match_word = is_string_match("Hello", ["Bye", "hELLO", "@vagavela"])
True
is_match_word = is_string_match("Hello", "Bye")
False
if re.search(r"\b(?<=\w)%s\b(?!\w)" % TEXTO, subject, re.IGNORECASE):
这将把TEXTO中的内容作为字符串插入到正则表达式中。
你也可以使用format关键字。Format方法会将{}占位符替换为您传递给Format方法作为参数的变量。
if re.search(r"\b(?=\w)**{}**\b(?!\w)".**format(TEXTO)**, subject, re.IGNORECASE):
# Successful match**strong text**
else:
# Match attempt failed
更多的例子
我有config。yml 使用流文件
"pattern":
- _(\d{14})_
"datetime_string":
- "%m%d%Y%H%M%f"
我使用的python代码
data_time_real_file=re.findall(r""+flows[flow]["pattern"][0]+"", latest_file)